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Radiative Transfer in highly variable cloud scenarios

Gimeno-Garcia, Sebastian and Trautmann, Thomas and Venema, Victor (2009) Radiative Transfer in highly variable cloud scenarios. Atmospheric Science Conference, 7 - 11 Sep 2009, Barcelona, Spain.

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Abstract

New technologies permit going continuously down into the spatial scale when observing the Earth's atmosphere from spaceborne instruments. At the same time, new computers are equipped with large main memories that allow to allocate bigger data arrays of optical properties. Historically, strongly approximative approaches have being used for the computation of the radiative transfer in remote sensing and climate/weather modeling applications. The main reasons are: On the one hand, to keep the computational time and memory save under some required limit, and on the other hand, to come up with easy-to-use analytical expressions that simplify the inversion process. The new generation of applications will have to deal with more complexity in optical fields and with the general solution of the radiative transfer in order to be able to reproduce the real radiance and flux fields. Within this scenario, we present results of the "exact" radiative transfer through high spatially resolved stochastically generated cloud fields embedded in realistic atmospheres. For this purpose, a versatile three-dimensional radiative transfer Monte Carlo code (MoCaRT) together with a robust cloud generator (IAAFT) able to add subscale variability have been used. The "exact" results are compared with those obtained using restrictive methods such as plane parallel and independent pixel approximations. The differences and deficiencies of these approximations are pointed out.

Document Type:Conference or Workshop Item (Poster)
Title:Radiative Transfer in highly variable cloud scenarios
Authors:
AuthorsInstitution or Email of Authors
Gimeno-Garcia, SebastianTechnische Universität München
Trautmann, Thomas
Venema, Victor Universität Bonn
Date:September 2009
Keywords:Clouds, Inhomogeneities, Monte Carlo, Cloud Downscaling.
Event Title:Atmospheric Science Conference
Event Location:Barcelona, Spain
Event Type:international Conference
Event Dates:7 - 11 Sep 2009
Organizer:ESA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung von Atmosphärenprozessoren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Dr.rer.nat. Franz Schreier
Deposited On:30 Nov 2009 09:46
Last Modified:30 Nov 2009 09:46

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